Alumina hollow microspheres supported gold catalysts for low-temperature CO oxidation: effect of the pretreatment atmospheres on the catalytic activity and stability

IF 2.2 4区工程技术 Q2 Chemistry Gold Bulletin Pub Date : 2014-09-17 DOI:10.1007/s13404-014-0152-y

Yu-Xin Miao, Lei Shi, Li-Na Cai, Wen-Cui Li

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引用次数: 15

Abstract

Hierarchically organized γ-Al₂O₃ hollow microspheres were prepared via a hydrothermal method using potassium aluminum sulfate and urea as reactants. The corresponding Au/Al₂O₃ catalysts were obtained using a deposition-precipitation (DP) method. The effect of the pretreatment under different atmospheres (N₂, air, and H₂) on the activity and stability of the Au/Al₂O₃ catalysts in CO oxidation was investigated. The results showed that the pretreatment under H₂ atmosphere improved the low-temperature CO oxidation activity. Furthermore, a 50?h long-term test at 30?°C showed no significant deactivation for the H₂-pretreated catalyst. Moreover, the catalytic activity was promoted by H₂O vapor in all cases, and the H₂-pretreated catalyst exhibited a good tolerance in the co-presence of CO₂ and H₂O. Finally, oxygen temperature-programmed desorption (O₂-TPD) and in situ diffuse reflectance infrared Fourier transform spectra (DRIFTS) revealed that the reductive atmosphere pretreatment greatly improved the CO adsorption capacity and facilitated the oxygen activation.

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氧化铝空心微球负载金催化剂的低温CO氧化:预处理气氛对催化活性和稳定性的影响

以硫酸铝钾和尿素为原料，采用水热法制备了结构有序的γ-Al2O3空心微球。采用沉积-沉淀(DP)法制备了相应的Au/Al2O3催化剂。研究了不同气氛(N2、空气和H2)下的预处理对Au/Al2O3催化剂CO氧化活性和稳定性的影响。结果表明，H2气氛下的预处理提高了CO的低温氧化活性。此外，50?30岁时的长期测试?温度为°C时，h2预处理的催化剂无明显失活。此外，在所有情况下，H2O蒸汽都促进了催化活性，并且h2预处理的催化剂在CO2和H2O共存时表现出良好的耐受性。氧程序升温解吸(O2-TPD)和原位漫反射红外傅里叶变换光谱(DRIFTS)结果表明，还原气氛预处理大大提高了CO的吸附能力，促进了氧的活化。

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来源期刊

Gold Bulletin 工程技术-材料科学：综合

CiteScore

3.30

自引率

4.50%

发文量

审稿时长

3 months

期刊介绍： Gold Bulletin is the premier international peer reviewed journal on the latest science, technology and applications of gold. It includes papers on the latest research advances, state-of-the-art reviews, conference reports, book reviews and highlights of patents and scientific literature. Gold Bulletin does not publish manuscripts covering the snthesis of Gold nanoparticles in the presence of plant extracts or other nature-derived extracts. Gold Bulletin has been published over 40 years as a multidisciplinary journal read by chemists, physicists, engineers, metallurgists, materials scientists, biotechnologists, surface scientists, and nanotechnologists amongst others, both within industry and academia. Gold Bulletin is published in Association with the World Gold Council.